Delocalized charge transfer mode

The isotropic shifts of the UB and 13C nuclear resonances and the e.s.r. spectrum of M[Crin 2,3-Me2-2,3-C2B9H2 2] (M = Cs or Et4N) salts have been determined and used to suggest that the mode of electron delocalization within this anion is primarily ligand-to-metal charge transfer.214... 

A number of different techniques have been applied to test the distance and orientation dependence of ET reactions (Closs and Miller, 1988 Closs et al, 1989 Liang et al., 1990 Reimers and Hush, 1990 Fox and Chanon, 1988 Wasielewski, 1989 Paddon Row and Jordan, 1988 Joachim et al, 1990 McConnell, 1961). Our method of analysing the mode of charge distribution in charged species is esr spectroscopy, which defines the timescale of the detectable dynamic species (Gerson, 1967 Kurreck et al, 1988 Wertz and Bolton, 1972). If an electron transfer is slow relative to the esr timescale (<10 7s) the spectrum corresponds to that of monomeric model compounds with a single electrophore. If the hopping process is rapid on the esr timescale, one will detect an effective delocalization. 

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